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Updated: Jul 14, 2025

Trajectory Data Analyses for Pedestrian Space-time Activity Study
Published on: February 25, 2013
Dataset for detecting motorcyclists in pedestrian areas
Nicolás Hernández Díaz1, Yersica C Peñaloza2, Y Yuliana Rios3
1Computer Eng., Universidad Tecnologica de Bolívar, Km 1 vía a Turbaco, Cartagena, 130010, Bolívar, Colombia.
This study introduces a scalable Python-based IoT methodology for road safety by collecting and refining CCTV images of pedestrians and motorcyclists. The system automates data acquisition and includes user-assisted labeling for creating a robust multiclass object classifier.
Area of Science:
- Computer Science
- Artificial Intelligence
- Internet of Things (IoT)
Background:
- Road safety is a critical concern, particularly for vulnerable road users like pedestrians and motorcyclists.
- Existing object detection systems often require large, well-labeled datasets, which are time-consuming and expensive to create.
- The integration of IoT devices and artificial vision offers a novel approach to data acquisition for traffic analysis.
Purpose of the Study:
- To develop a semi-automated, scalable methodology for collecting and processing road imagery using IoT devices.
- To construct a multiclass object classifier for identifying pedestrians and motorcyclists.
- To create an efficient data pipeline for generating labeled datasets from public CCTV feeds.
Main Methods:
- Implementation of an Internet of Things (IoT) system using Python for continuous image acquisition from public CCTV cameras.
- Application of artificial vision techniques for automated image analysis and chronological data sorting.
- Development of two algorithms for dataset debugging: one for user-assisted labeling via Regions of Interest (ROI) and hotkeys, and another for verification of labeled data.
Main Results:
- Successful acquisition and processing of asynchronous image data from 80 CCTV cameras in Medellin, Colombia.
- Creation of a semi-automated pipeline for generating a debugged dataset suitable for training machine learning models.
- Demonstration of a scalable methodology for building multiclass object classifiers for road safety applications.
Conclusions:
- The proposed IoT-based methodology offers a scalable and efficient solution for creating object detection datasets from real-world traffic scenarios.
- The semi-automated approach significantly reduces the effort required for data labeling, accelerating the development of road safety AI.
- This work contributes to improving road safety by enabling the construction of more accurate multiclass object classifiers.
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